I dont know where he is comming from. The new NP rules mean the gun laws of the state where the NP is, determines what you can do in the park.
Example, YellowStone Park is mostly in Wyoming, there for the rules govern the carrying of guns in Yellow Stone come under Wyomings Gun Laws. (Or lack there of).
Wyoming is differant then California, therefore the carrying of firearms in Yellowstone would be differant the Yosimity.
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071